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Alert Notice 588: Long-term CCD monitoring of ER UMa-type variable DDE 48 in Vulpecula

July 21, 2017: The following request for AAVSO assistance has been received from Denis Denisenko (Sternberg Astronomical Institute, Moscow State University) to help characterize "...the cataclysmic variable DDE 48 in Vulpecula. This CV belongs to the rare ER UMa subtype of dwarf novae, with only 6 other stars in VSX being classified as UGER. According to 2016-2017 observations by Nikolay Mishevskiy (MNIC) and Denis Denisenko (DDE), this variable is very active, with superoutbursts to magnitude V=15.4 occurring approximately once a month.

Solar Bulletin - Volume 73, Number 06

The June Solar Bulletin is now available. Please visit the Solar Bulletin web page to download your copy:

https://www.aavso.org/solar-bulletin

The June SID Data report is available here: https://www.aavso.org/sid-database

Alert Notice 587: Observations of FI Vir (Ross 128) needed this week

July 17, 2017: Dr. Abel Méndez (University of Puerto Rico at Arecibo) has requested AAVSO assistance in follow-up observations of the flare star FI Vir (Ross 128) subsequent to his radio observations obtained yesterday (July 16) with the Arecibo and Green Bank (GBT) telescopes and the Allen Telescope Array (ATA).

Alert Notice 586: Status of 20 cataclysmic variables needed for WHT campaign

July 7, 2017: Roque Ruiz-Carmona (Ph.D. candidate, Institute of Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen, The Netherlands) has requested AAVSO assistance in determining the status of 20 eclipsing cataclysmic variables (CVs) in order to select one system in outburst for observation with the William Herschel Telescope (WHT) at La Palma, to detect and study spiral density waves in the system. The WHT observations will begin on 2017 July 11 UT.

Charts and Sequences Team Update June 2017

The charts and sequences team has been busy over the last several months preparing new sequences for newly discovered objects and revised sequences intended to improve existing sequences. If you observe any of these objects please update your charts and/or sequences. A file in .xlsx format is attached below for your convenience.

AAVSO Newsletter 73, July 2017, is published

AAVSO Newsletter 73, July 2017 is now available to members

The AAVSO Newsletter is a periodic, general forum that supports our various observing programs with lists of new targets, observing programming ideas, and general information that spans a wide area of interest. Guest writers contribute pieces that can range from current events to book reviews.

http://www.aavso.org/aavso-newsletter

JAAVSO volume 45, number 1, June 2017, print version now available

eJAAVSO

The Journal of the American Association of Variable Star Observers
Volume 45, Number 1, 2017

The printed version of this issue is now available from Createspace via the link below.

Volume 45, Number 1, 2017

Alert Notice 583: Photometry requested for Red Dots campaign

June 16, 2017:  John Strachan (Queen Mary University of London) and Dr. Guillem Anglada-Escude (Queen Mary University of London) have requested AAVSO assistance in the monitoring of three M dwarf stars as part of the Red Dots campaign.

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